Modelling Geometric Properties in Construction of Special Devices

The paper presents the collection of assumptions for the conception of construction solutions of a device for measuring and calibrating portable scales for registering loads of vehicles travelling on public roads. The analysis of rigidity of particular subsystems of the construction has been conducted. Strength properties as well as displacements of the main structural joints of the upper and lower plate of the test bench as well as the pillars connecting them have been analysed. Based on the analysis of stress and displacement values of the structural plates in the function of their thickness, their geometric dimensions have been chosen. The next step was modelling the elongation of the structural pillars in the function of load. As a result of this work, the geometry of the circular cross section pillars with the highest rigidity has been chosen. The outcome is the proposed change in construction properties with regards to geometry and the main body load. On the basis of the conducted research, the design documentation of the device has been created. A new prototypical device has been made on this basis. The work has been implemented at Okręgowy Urząd Miar (Local Office of Measures) in Poznan. These research and design efforts have resulted in achieving higher accuracy of calibrating mobile vehicle scales.